Pausing and Resuming a Broker

The subcommand imqcmdpausebkr pauses a broker, suspending its connection service threads and
causing it to stop listening on the connection ports:

imqcmd pause bkr [-bhostName:portNumber]

For example, the following command pauses the broker running on host myhost at port 1588:

imqcmd pause bkr -b myhost:1588 -u admin

Because its connection service threads are suspended, a paused broker
is unable to accept new connections, receive messages, or dispatch messages.
The admin connection service is not suspended,
allowing you to continue performing administrative tasks needed to regulate
the flow of messages to the broker. Pausing a broker also does not suspend
the cluster connection service; however, since message
delivery within a cluster depends on the delivery functions performed by the
different brokers in the cluster, pausing a broker in a cluster may result
in a slowing of some message traffic.